<?php

/*
 * 
 */

class Redis_queue {

    /**
     * Default config
     *
     * @static
     * @var	array
     */
    protected static $_default_config = array(
        'socket_type' => 'tcp',
        'host' => '127.0.0.1',
        'password' => NULL,
        'port' => 6379,
        'timeout' => 0
    );

    /**
     * Redis connection
     *
     * @var	Redis
     */
    protected $_redis;

    /**
     * An internal cache for storing keys of serialized values.
     *
     * @var	array
     */
    protected $_serialized = array();

    // ------------------------------------------------------------------------

    /**
     * Class constructor
     *
     * Setup Redis
     *
     * Loads Redis config file if present. Will halt execution
     * if a Redis connection can't be established.
     *
     * @return	void
     * @see		Redis::connect()
     */
    public function __construct($params = []) {
        if (!$this->is_supported()) {
            log_message('error', 'Cache: Failed to create Redis object; extension not loaded?');
            return;
        }

        $CI = & get_instance();

        if ($CI->config->load('redis', TRUE, TRUE)) {
            $config = array_merge(self::$_default_config, $CI->config->item('redis'));
        } else {
            $config = self::$_default_config;
        }

        print_r($config);

        $this->_redis = new Redis();

        try {
            if ($config['socket_type'] === 'unix') {
                $success = $this->_redis->connect($config['socket']);
            } else { // tcp socket
                $success = $this->_redis->connect($config['host'], $config['port'], $config['timeout']);
            }

            if (!$success) {
                log_message('error', 'Cache: Redis connection failed. Check your configuration.');
            }
            var_dump($config);
            if (isset($config['password'])) {
                if (isset($config['username'])) {
                    $auth = $this->_redis->auth($config['username'] . ":" . $config['password']);
                } else {
                    $auth = $this->_redis->auth($config['password']);
                }
                if (!$auth) {
                    log_message('error', 'Cache: Redis authentication failed.');
                }
            }
            if (isset($config["database"])) {
                $select = $this->_redis->select($config["database"]);
                if (!$select) {
                    log_message('error', 'Cache: Redis select database failed.');
                }
            }
        } catch (RedisException $e) {
            log_message('error', 'Cache: Redis connection refused (' . $e->getMessage() . ')');
        }

        // Initialize the index of serialized values.
        $serialized = $this->_redis->sMembers('_ci_redis_serialized');
        empty($serialized) OR $this->_serialized = array_flip($serialized);
    }

    // ------------------------------------------------------------------------

    /**
     * Get cache
     *
     * @param	string	$key	Cache ID
     * @return	mixed
     */
    public function get($key) {
        $value = $this->_redis->get($key);

        if ($value !== FALSE && isset($this->_serialized[$key])) {
            return unserialize($value);
        }

        return $value;
    }

    // ------------------------------------------------------------------------

    /**
     * Save cache
     *
     * @param	string	$id	Cache ID
     * @param	mixed	$data	Data to save
     * @param	int	$ttl	Time to live in seconds
     * @param	bool	$raw	Whether to store the raw value (unused)
     * @return	bool	TRUE on success, FALSE on failure
     */
    public function save($id, $data, $ttl = 60, $raw = FALSE) {
        if (is_array($data) OR is_object($data)) {
            if (!$this->_redis->sIsMember('_ci_redis_serialized', $id) && !$this->_redis->sAdd('_ci_redis_serialized', $id)) {
                return FALSE;
            }

            isset($this->_serialized[$id]) OR $this->_serialized[$id] = TRUE;
            $data = serialize($data);
        } elseif (isset($this->_serialized[$id])) {
            $this->_serialized[$id] = NULL;
            $this->_redis->sRemove('_ci_redis_serialized', $id);
        }

        return $this->_redis->set($id, $data, $ttl);
    }

    // ------------------------------------------------------------------------

    /**
     * Delete from cache
     *
     * @param	string	$key	Cache key
     * @return	bool
     */
    public function delete($key) {
        if ($this->_redis->delete($key) !== 1) {
            return FALSE;
        }

        if (isset($this->_serialized[$key])) {
            $this->_serialized[$key] = NULL;
            $this->_redis->sRemove('_ci_redis_serialized', $key);
        }

        return TRUE;
    }

    // ------------------------------------------------------------------------

    /**
     * Increment a raw value
     *
     * @param	string	$id	Cache ID
     * @param	int	$offset	Step/value to add
     * @return	mixed	New value on success or FALSE on failure
     */
    public function increment($id, $offset = 1) {
        return $this->_redis->incr($id, $offset);
    }

    // ------------------------------------------------------------------------

    /**
     * Decrement a raw value
     *
     * @param	string	$id	Cache ID
     * @param	int	$offset	Step/value to reduce by
     * @return	mixed	New value on success or FALSE on failure
     */
    public function decrement($id, $offset = 1) {
        return $this->_redis->decr($id, $offset);
    }

    // ------------------------------------------------------------------------

    /**
     * Clean cache
     *
     * @return	bool
     * @see		Redis::flushDB()
     */
    public function clean() {
        return $this->_redis->flushDB();
    }

    // ------------------------------------------------------------------------

    /**
     * Get cache driver info
     *
     * @param	string	$type	Not supported in Redis.
     * 				Only included in order to offer a
     * 				consistent cache API.
     * @return	array
     * @see		Redis::info()
     */
    public function cache_info($type = NULL) {
        return $this->_redis->info();
    }

    // ------------------------------------------------------------------------

    /**
     * Get cache metadata
     *
     * @param	string	$key	Cache key
     * @return	array
     */
    public function get_metadata($key) {
        $value = $this->get($key);

        if ($value !== FALSE) {
            return array(
                'expire' => time() + $this->_redis->ttl($key),
                'data' => $value
            );
        }

        return FALSE;
    }

    // ------------------------------------------------------------------------

    /**
     * Check if Redis driver is supported
     *
     * @return	bool
     */
    public function is_supported() {
        return extension_loaded('redis');
    }

    // ------------------------------------------------------------------------

    /**
     * Class destructor
     *
     * Closes the connection to Redis if present.
     *
     * @return	void
     */
    public function __destruct() {
        if ($this->_redis) {
            $this->_redis->close();
        }
    }

    /*
     * 进行队列
     */

    public function rpush($key, $val) {
        $this->_redis->rpush($key, $val);
    }

    /*
     * 消费队列
     */

    public function lpop($key) {
        return $this->_redis->lpop($key);
    }

    /*
     * 查看
     */

    public function lrange($key, $start = 0, $end = -1) {
        return $this->_redis->lrange($key, $start, $end);
    }

}
